Dobby mechanism for looms.



PATENTED JULY 2, 19,07.

R. KOHLHAAS.

DOBBY MEGHANISM POR LOOMS.

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APPLIUATIGN FILED AUG. 2, 1906.

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BOBBY MBGHANISM POR4 LOOMS,

APPmoATIoN FILED AUG. z. 19o@A 4 SHEETS-TSHEET Z.

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APPLICATION FILED AUG. 2, 1906.

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No. 859,085. PATENTED JULY 2. 1907.

RKOHLILAAS.v BOBBY MBGHANISM FOR Looms..

APPLICATION FILED AUG. 2, 1906.

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UNITED STATES PATENT OFFICE.

DOBBY MECHANISM FOR LOOMS. V

Specification of Letters Patent.

Patented July 2, 1907.

Application filed August 2,1906. Serial No. 328,832.

To all whom it 'may concern:

Be it known that I, 'RnYNoLn KoHLHAAs, a citizen of the United States,residing at Paterson, Passaic county, State of New Jersey, have inventednew and useful Improvements in Dobby Mechanism for Looms, of which thefollowing is a specification.

This invention relates to an improved open shed dobby mechanism forlooms, which is of greatly simplified construction, reliable in itsoperation, and of great durability.

In the accompanying drawings: Figure l is an end elevation of myimproved dobby; Fig. 2 a front view thereof; Fig. 3 a rear view, partlybroken away and with some of the parts omitted; Fig. 4 a verticalsection on line 4 4, Fig. l g Fig. 5 a detail section through thecardcylinder and adjoining parts; Fig. 6 a cross section on line 6 6,Fig. 5; Fig. 7 a detail of the leveling device; Figs. 8, 9 and 10 aredetails of parts of the coupled levers; Fig. 11 a section on line 1l-11,Fig. 8, Fig. 12 a detail of the connection between lever and hook; Fig.13 a section on line 13-13, Fig. 12, and Fig. 14 a detail of the lifter.

In the frame 2() of the dobby is journaled a rock-shaft 2l. Fast on eachend of this shaft is a two-arm lever 22, one of said levers having anextension 23 which is connected to one member 24 of a jointed rod, theother member 25 of which is eccentrically pivoted to the driving wheel26. Bythe means described, an oscillating movement is imparted to levers22. To the upper ends of these levers are pivoted links 27 ,Ewhich arein turn pivoted at 28 to reciprocating rods 29, connected by an upperbar 30. In like manner the lower ends of levers 22 are connected bylinks 3l to rods 32, to which is attached a lower bar 33` Thus theoscillation of shaft 21 will alternately advance and retract bars 30,33.

Means are provided by which either of the bars may be operativelyconnected with the cords 34 that serve to raise the sheds of the loom inthe usual manner. These means are as follows: Upon a shaft 35 turn aseries of curved levers 36 provided with integral rack-extensions 37engaged by the cords 34. Lever 36 has a hook 38 of reduced thickness,and shoulders 39 below such hook. Back to back with hook 38 is a secondhook 40, formed at about the center of a two-arm lever 4l. Hooks 38, 40,are coupled-to each other by a yoke or slotted link 42 supported uponshoulders 39, and having a nose 43 bearing against the edge of hook 38.Link 42 serves to couple lever 41 to lever 36, without the use of pinsand in such a manner that the parts may be readily assembled andseparated. To upper end of lever 41 is ulcrumed the shank 44 of an upperhook 45. This shank is humpcd or has a raised section 46 at a distanceback oi hook 45. In like manner there is pivoted to the lower end oflever 4l, the shank 47 of a hook 48, said shank having the hump orraised section 49. The beaks oi both hooks 45, 48 are directeddownwards.

Abutments 50, 51 on frame 20, limit the oscillation of lever 4l. The`pivotal connection between lever 4l and shanks 44 and 47, is preferablysuch that the parts may be readily assembled and separated. As shown,each end of lever 4l terminates in a disk or head 52 having asector-shaped slot 53, which opens into a cen@ tral eye 54 the inner endof slot 53 being narrower than the diameter of said eye. The end of eachof the Vshanks 44, 47, is made tapering to correspond to the shape oislot 53, and is provided with a knuckle 55 and a slot 56 in proximity tosuch knuckle. The latter engages eye 54, while disk 52 enters slot 56,as shown.

By the construction described, the parts may be assembled by laterallyintroducing contracted end of shank 44 and knuckle 55 into slot 53 andeye 54, respectively, and then turning said shank until disk 52 isreceived within slot 56. In this way any disengagement of the partswhile'in their operative position is prevented.

The relative position of the parts is such that by lowering the hooks45, they may be brought into engagement with bar 30, while the hooks 48may in like manner be brought into engagement with bar 33. If either ofthe upper' hooks is thus made to engage bar 30, the outward movement ofthe latter will, by said hook, be transmitted to the upper end of lever4l, so that the latter will swing on its lower head 52, bearing againstabutment 5l. In this way the lever 36 is drawn downwards on fulcrum 35,to raise, by means of cord 34, the corresponding shed, which is weightedas usual. In like manner when either of the lower hooks 48 is swungdown, said hook will engage bar 33 to swing lever 41 on its upper head52 and thereby lower lever 36 to again raise the shed. If either one ofthe hooks 45 and 48 or" one and the same lever 41 is in engagement withits bar, to raise the shed, and during the next pick, the other hook ofsuch lever is also brought into en` gagement with its bar, then thelever 4l will befreely swung on yoke 42, while no motion will betransmitted to lever 36. Thus the shed will remain raised or held up forany given number of picks, without working up and down at each pick.

The hooks 45, 48 connected to thesame lever 41, are both operated bymeans of a single lifter, in lieu of being operated by two separatelifter-s, as heretofore. This .results in a great simplieation of themachine, more particularly, because but a single card and card-.cylinder performs the work ol" operating the upper, as well as thelower hooks, while heretofore a separate card and card-cylinder wasnecessary for each set of hooks.

The litters 57 have bent upperkends 58 by which they are normallysuspended Vfrom a slotted top bar 59 of frame 20. The downwardly bentupper end 58 of each lifter engages a perforation adjoining that throughwhich the lifter passes, so as to hold the latter rorn rotation duringthe vertical movement of the lifter. Each lifter has an upper step orshoulder 60 adapted to engage shank 44, and a lower step or shoulder 61adapted to engage shank 47. ranged respectively vertically below theshanks o f hooks 45, 48, so as to bodily engage said shanks when thelifters are raised. The lifters are guided near their lower ends by aperforated bar 62, and are adapted to be supported by the card 63 thatpartly surrounds the cardcylinder 64. The latter may be raised andlowered and also rotated in the usual manner, and is journaled inswinging arms 65, which receive oscillating motion by rod 66 from crankwheel 67 the latter making double the number of revolutions as wheel 26.Cylinder 64 is secured to arms 65 by hooks 68, and is held in positionby a spring-plunger 69, while it is rotated by spring-influenced hook 70in the usual manner.

It will be seen that bars 30 and 33 receive a reciprocating movementfrom crank disk 26, in such a manner that while bar 30 moves inwards, tothe lef tin Fig. 4), bar 33 will move outwards. When bar 3() is in itsextreme outward position, bar 33 will therefore be in its extreme inwardposition, and Vice versa. During the reciprocating movement of bars 30,33, cylinder 64, together with card 63, receives oscillating movementfrom crank disk 67, but as the latter makes twice as many rotations asdisk 26, cylinder 64 will make two oscillations while bars 30, 33 makeeach one complete stroke. The movements are so timed that when the bars30, and 33 arrive at their terminal positions, cylinder 64 will beraised. As the latter is provided with recesses 7l adapted to be broughtbelow the perforations of card 63, it is clear that whenever theserecesses are covered by an imperforate portion of the card, the lifters57 will be raised by the rising cylinder,

` while, when the recesses are uncovered by being alined withperforations of the card, the lifters will remain in their loweredposition. When the shed is lowered, lever 41 hangs upright to engageboth abutments 59 and 5l, so that both hooks 45 and 48 are retracted andvertically above one another. 1n this position the hooks rest onsupports 72, 73, of a slotted frame 74, which supports are placed atsuch a height that the hooks are in the path of bars 30, 33,respectively.

'lf it is desired to hold the shed in its lowered position, hooks 45, 48must be raised at the end of each stroke of bars 30 and 33, so asto'clear such bars when they start their outward movement. This iseffected by cylinder 64, its recess 71, directly below lifter 59, be#

, ing covered by an imperforate portion of the card.

The upward movement of the card and cylinder will therefore cause thelifter 57 to be raised, so as to swing hooks 45 and 48 upwards and'cause them to clear bars 30, 33 respectively.

Wherever it is desired to raise the shed, card 63 is provided with aperforation below lifter 57, so that the latter is not taken along bythe upward movement of cylinder 64. 1n this way the hooks 45 and 48remain lowered and either one or the other of them will be taken alongby its outwardly moving bar 30 or 33. Whether hook 45 or hook 48 is thustaken along, depends upon the position of bars 30 and 33. If bar 30 isin its retracted position, hook 45 will become engaged by said bar andbe taken along when the latter moves Shoulders 60 and 61, arearoutwardly, while hook 48 remains idle. In similar manner hook 48 willbe taken along by bar 33 if the latter happens to be in its retractedposition, while hook 45 remains idle. Fig. 4 shows the position of theparts when a hook 48 has been carried to its extreme outward position bybar 33. During the outward movement of this hook, lever 41 has swunglever 36, as above described, and the shed has been opened by cord 34.If it is desired to immediately lower the shed, the meanwhile rotatedand raised cylinder 64 has again presented an imperforate portion of thecardto lifter 57, so that the latter is raised and upper hook 45 isbrought out of engagement with bar 30 by upper shoulder 60. This upwardmovement of lifter 57, while hook 48 still engages bar 33, is renderedpossible by providing shank 47 with the hump 49. As this hump is broughtvertically above lower shoulder 61 of lifter 57, when the hook 48 is inits outward position, the lifter 57 may be raised to swing hook 45upward without causing hook 48 to be interfered with. 1f it is, however,desired to hold the shed raised for a number of picks, the rotated andraised cylinder 64 must present a perforation to lifter 57, so that thelatter may enter a corresponding recess 71 in the cylinder. In this wayhook 45 remains in its lowered position and will be taken along by theadvancing bar 30, while hook 48 will, under the influence of theweighted shed, follow the receding bar 33. Lever 36 is prevented frombeing raised and thereby lowering the shed, as longas both hooks 45 and48 of the same lever 4l, are in engagement with their bars. Theoperation of the parts is the same, in substance, if bar 30 takes alonghook 45, when shoulder 61 may raise hook 48, while hook 45 is notinterfered with by shoulder 60, owing to raised shank-section 46.

Means are provided for permitting a ready leveling of the warp threads,`without imparting an objectionable shock to the dobby and loom. Thesemeans are as follows: In bearing 75 of frame 20 turns a rock-shaft 76,one end of which carries an arm 77 having ,over-balancing weight 78. Themovement of the rock-shaft is controlled by ahand-spring 79 which isfastened to lever 77, and is under control of the operator. Rock-shaft76 is provided near each end with a lever 80, to which is pivoted at 81an arm 82, the two arms 82 being connected at their upwardly inclinedfree ends by a levelingblade 83. Each arm has a curved lower side, asshown, and is arranged above an abutment 84. If the warp threads are tobe leveled, a pull on string 79 will rock shaft 76 to advance arms 82 bylevers 80. During the first part of the forward stroke of the arms, theywill freely advance below Shanks 47 without coming into engagementtherewith. During the latter part of the forward stroke, however, thearms willI be raised by toes 85 formed on bars 33, so that blade 83passes between bar 33 and shank 47, and thereby raises hook 48 out ofengagement with the bar. All the advanced hooks 48 being thus made toclear bar 33, the operator gradually slackens the string 79, so that thehooks will be slowly retracted by the weighted shed. The latter willconsequently be gently lowered, its descent being under the completecontrol of the operator, so that all shocks are avoided.

What l claim is:

f1. In a dobby mechanism for looms, a pair of reciproeating bars, a pairof hooks adapted to engage said bars,

shed-raising means operatively connected to the hooks, a top bar havingadjoining perforatons, a lifter passing through one of said perforationsand having a bent upper end that engages the other perforation, andapair of shoulders on the lifter arranged vertically below the hooks,substantially as specified.

2. In a dobby mechanism for looms, a shed-raising lever having a firsthook and a pair of shoulders beneath said hook, combined with a secondlever having a hook placed back to back relatively to the rst hook,means for oscillating the second lever, and a link embracing both hooksand supported on the shoulders of the first hook, substantially asspecified.

3. In a dobby mechanism for looms, a shed-raising lever having a firsthook and a pair of shoulders beneath said hook, combined with a secondlever having a hook placed back to back relatively to the first hook,means for oscillating the second lever, a link embracing both hooks andsupported on the shoulders of the first hook, and a nose l on the linkthat engages the back of said first hook, substantially Vas specified.

4. In a dobby mechanism for looms, a series of hooks, combined with arock-shaft, a hand-controlled over-balanced lever secured thereto, armsoperatively connected t0 said shaft, a blade connecting the arms, andmeans for gradually raising the blade into operative engagement with thehooks, substantially as specified.

5. In a dobby mechanism for looms, a rock-shaft@ handcontrolledover-balanced lever secured thereto, arms operatively eonnected to saidshaft and having upwardly inclined ends, a blade connecting said ends,and a bar having toes adapted to engage the arms, substantially asspecified.

Signed by me at Paterson, New Jersey, this 30th day of July, 1906.

REYNOLD KOHLHAAS.

Witnesses FRANKLIN HOLLAND, Louisa HOLLAND.

